Table of contents

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1. Introduction to Biochemistry4h 34m
2. Water3h 23m
3. Amino Acids8h 10m
4. Protein Structure10h 4m
5. Protein Techniques14h 5m
6. Enzymes and Enzyme Kinetics13h 38m
7. Enzyme Inhibition and Regulation 8h 42m
8. Protein Function 9h 41m
9. Carbohydrates7h 49m
10. Lipids5h 49m
11. Biological Membranes and Transport 6h 37m
12. Biosignaling9h 45m
Review 1: Nucleic Acids, Lipids, & Membranes2h 47m
Review 2: Biosignaling, Glycolysis, Gluconeogenesis, & PP-Pathway3h 12m
Review 3: Pyruvate & Fatty Acid Oxidation, Citric Acid Cycle, & Glycogen Metabolism2h 26m
Review 4: Amino Acid Oxidation, Oxidative Phosphorylation, & Photophosphorylation1h 48m

6. Enzymes and Enzyme Kinetics

Cofactor

Biochemistry

6. Enzymes and Enzyme Kinetics

Cofactor

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Multiple Choice

Aldoase requires Zn²⁺ for catalysis. Under cellular conditions of zinc deficiency, aldoase is referred to as:

Apoenzyme.

Coenzyme.

Holoenzyme.

Prosthetic group.

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Understand the role of metal ions in enzyme activity: Enzymes often require metal ions as cofactors to be active. These metal ions can be essential for the enzyme's catalytic function.

Define the term 'apoenzyme': An apoenzyme is the inactive form of an enzyme, which lacks its necessary cofactor. In this case, the cofactor is Zn²⁺.

Define the term 'holoenzyme': A holoenzyme is the active form of an enzyme, which includes its apoenzyme and the necessary cofactor(s).

Consider the conditions of zinc deficiency: Under zinc deficiency, the enzyme aldoase would lack its Zn²⁺ cofactor, making it an apoenzyme.

Review the options: Given the definitions, the correct term for aldoase under zinc deficiency is 'apoenzyme', as it is inactive without its Zn²⁺ cofactor.